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The geologic time scale gts is a system of chronological dating that relates geological strata stratigraphy to time it is used by geologists paleontologists . This document discusses the way radiometric dating and stratigraphic principles are used to establish the conventional geological time scale. An introduction to deep time the geological timescale and dating the earths past. Chapter 4 major geological events t into a timeline beginning with the formation of the earth 41 the origin and development of life william smith was a canal